Crystal lamp bulb



FIG. 1 is a perspective view of the new design;

FIG. 2 is a front (rear) view thereof (the front and the rear views are identical);

FIG. 3 is a left (right) side view thereof (the left and the right side views are identical);

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a crystal lamp bulb, as shown and described. 